Enhance Your Penis in the Shower

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I don't see why it would be a problem. I don't think i have phimosis (don't know a lot about it) but my foreskin usually won't fully retract when I am erect unless I am having sex. That being said, when I jelq my foreskin is not retracted at all so you should be ok.

Have you considered stretching or circumcision? I used to jelq when I had phimosis, but unfortunately, I only did like 3 times. After that I got circumcised because I wanted to get rid of my foreskin. I'll tell you one thing though, it's more comfortable jelquing without foreskin for me at least. You feel like you're getting a better workout.